This is the first video I've shot with the new camera. Better??
That's Herman who's in the frame to begin with, and Henrik who comes swimming in from the right after a few moments.
What they're doing is they're begging for food. They eat every other day, and today is a feeding day, so they're hungry (well, more so than usual; they are allegedly always hungry ;-). I hand feed them and as a result they exhibit the learned behavior that you see here - they associate human fingers with food. Strongly, in fact. So when they want to show that they want something to eat, they bite my fingers. Or try to bite them through the glass walls of their tank, as you see here. :-) Because food comes out of my fingers, that's where it comes from in their world. :-)
13 hours ago